In a speech before the AFL-CIO convention in Philadelphia, Clinton noted the recent leak of a massive trove of financial documents, known as the Panama Papers, that revealed information about the financial holdings of wealthy politicians and public figures around the world.

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"Some of you may have just heard about these disclosures about outrageous tax havens and loopholes that super-rich people across the world are exploiting in Panama and elsewhere," Clinton said.

The former secretary of State said she would work to restrict such tax avoidance practices as president.

"Now some of this behavior is clearly against the law, and anyone who violates the law anywhere should be held accountable, but it's also scandalous how much is actually legal. That's why last year, I proposed a plan to shut down the so-called private tax system for the mega-wealthy," she said.

"We're going after all these scams and make sure that everyone pays their fair share here in America. I'm gonna hold them accountable and we're gonna have a special effort to track all these resources wherever they might lead."